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	肃北地区稀有植物裸果木种群的空间分布格局
其他题名	The spatial distribution patterns of rare plant Gymnocarpos przewalskii communities in Subei
	柴永青 1; 曹致中 1; 蔡卓山 1; 万丽霞 2; 李学玲 3
来源期刊	草业学报
ISSN	1004-5759
出版年	2010
卷号	19 期号:5 页码:239-249
中文摘要	为了探索肃北荒漠地区裸果木种群分布格局,成因和维持机制,根据植被类型,地形地貌和海拔,选择了6个样地,共随机设置60个样方,应用方差/均值,负二项参数,扩散型指数,丛生指标,平均拥挤度指数和聚块性指数,Poisson分布等方法,采用Kolmogogorov-Smirnov检验进行显著性检验,分析在不同样地,不同海拔下的裸果木种群空间分布格局.研究表明,在红柳峡干沟和一棵树干河床地带,裸果木种群呈集聚分布,集聚原因主要是由于与裸果木克隆生长特性及其对恶劣环境的适应性密切相关.在芦草沟和干沟口子山前干河床地带,裸果木种群为随机分布,是由于裸果木自身有性繁殖力衰退,幼龄的植株少,中老龄植株多,各物种间和裸果木种内的竞争是主要原因,还受地形地貌,生境,洪水和泥石流等自然灾害的影响.野马河种群是随机分布与集群分布的混合类型,各物种间和裸果木种内竞争造成其随机分布,而强烈的洪水和泥石流冲刷作用促成集群分布.马鬃山金庙井种群为集群分布,但集聚程度并不高,集聚原因跟其生境和土壤有关.由于这一地带地处洪积扇平原,地势平坦,上游裸果木的种子随着洪水的缓缓冲刷和泥沙的淤积,沉积在这一带,是造成这一地区裸果木集群分布的原因.依据海拔来看,在1500~1550m区段,为集群分布,但集聚程度并不高.海拔在2400~2450和2450~2500m区段,均为随机分布,是肃北裸果木的集中分布区.海拔在2700~2750m区段,属于集群与随机混合型分布格局.裸果木在肃北地区的种群空间分布格局是由自身的繁殖特性和自然灾害两大主要因素共同作用的结果,同时与其他生物特性,环境因子和人为因素也密切相关
英文摘要	In order to explore the spatial patterns of Gymnocarpos przewalskii in the Subei desert,as well as its causes and maintenance mechanisms,60 quadrats are randomly set according to the vegetation types, the topography, geomorphology and the different altitudes. The variance/mean ratio, parameter of negative binominal, dispersal index, index of clumping, index of mean crowding, index of aggregation and index of patchiness, poisson distribution method are used to analyze the spatial distribution patterns and Kolmogogorov-Smirnov test for significance test. The results show that the population distributions of the G.przewalskii are contagious distribution at the dry beds of Gangou and One tree;taking on random distribution at the foreland dry bed areas of Lucaogou and Gangoukouzi, which is due to intense competition between middle-old plants against the background of their sexual reproductive decline and lack of seedlings;The intermediate type between random and contagious distribution at Yema River, which is due to the combined affect of intraspecies and interspecific competition, and the scouring of forceful deluge and mud-rock flow, coming close to contagious distribution at Jinmiaojing in Mazong mountain area, the reason of contagious distribution was related with its ecosystem environment. The seeds of G.przewalskii silted gradually in this area with eroding by flood and filling by silt because of which lies in puluvial fan plain. All of this caused the contagious distridution of G.przewalskii in the area. From the altitude standpoint, the population distributions of the G.przewalskii is weak contagious distribution at 1500-1550m, random distribution at 2400-2 450and 2450-2500m where mostly living from the Subei desert;the intermediate type between random and at 2700-2750m.The spatial patterns of G. przewalskii in the Subei desert result from the major affect of its propagation characteristics and natural disaster, together with other factors, such as Human activity and environmental factors
中文关键词	肃北 ; 裸果木 ; 空间分布格局
英文关键词	Subei Gymnocarpos przewalskii spatial distribution patterns
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:4038877
来源机构	兰州大学 ; 甘肃农业大学 ; 西北师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/224760
作者单位	1.甘肃农业大学草业学院, 兰州, 甘肃 730070, 中国; 2.西北师范大学生命科学院, 兰州, 甘肃 730070, 中国; 3.兰州大学草地农业科技学院, 兰州, 甘肃 730020, 中国
推荐引用方式 GB/T 7714	柴永青,曹致中,蔡卓山,等. 肃北地区稀有植物裸果木种群的空间分布格局[J]. 兰州大学, 甘肃农业大学, 西北师范大学,2010,19(5):239-249.
APA	柴永青,曹致中,蔡卓山,万丽霞,&李学玲.(2010).肃北地区稀有植物裸果木种群的空间分布格局.草业学报,19(5),239-249.
MLA	柴永青,et al."肃北地区稀有植物裸果木种群的空间分布格局".草业学报 19.5(2010):239-249.